Schneider Electric LC1D50AM7C

Schneider Electric LC1D50AM7C is an AC contactor belonging to the locally-manufactured TeSys Deca series.

Basic Parameters

Rated Voltage: 690V

Rated Current: 50A

Auxiliary Contacts: 1NO (Normally Open) + 1NC (Normally Closed)

Control Circuit: AC 50/60Hz

Control Voltage: 220VAC

Pole Number: 3P

Mechanical and Electrical Service Life

No-load Mechanical Service Life: 6 million operations

Electrical Service Life: 1.2 million operations under AC-1 utilization category with Ue ≤ 440V; 1.5 million operations under AC-3 utilization category with Ue ≤ 440V; 2 million operations with Ue = 660/690V

Product Features

Compact Installation: Contactors up to 38A and protective components have a width of only 45mm. Surge suppressors can be installed without tools, and the mechanical interlock of reversible contactors does not occupy additional space.

High Integration: Integrated with 1 normally open/1 normally closed auxiliary contacts; DC coils are built-in with bidirectional current suppression diodes.

Safe and Reliable: Main circuit and control circuit are clearly distinguished; adopted mirror contact design to ensure 100 million reliable operations; equipped with protective cover to prevent accidental connection.

Superior Quality: DC coils feature wide-range control voltage (0.7~1.25Uc), with strong seismic resistance, low noise and high-strength wiring terminals.

As a 3-pole, 50A, 220VAC coil AC contactor in the TeSys Deca series, Schneider Electric LC1D50AM7C is mainly suitable for AC-3 category squirrel cage motor control (22kW@400V) and various industrial load scenarios. The following is a structured description of its typical application fields and scenarios.

1. Application Subdivision by Load Type
2. Motor Control (AC-3 Core Scenario)

Applicable Motor Types: Squirrel cage asynchronous motors (e.g., water pumps, fans, compressors, conveyor belts)

Power Adaptability: Maximum 22kW at 400V, 40HP at 480V, derated operation at 690V

Typical Working Conditions: Frequent start-stop, long-time operation, reversible control (with mechanical interlock), star-delta starting circuit

2. Application for Other Load Types

Resistive Loads: Resistance furnaces, heaters, drying equipment (AC-1 utilization category, electrical service life up to 1.2 million operations)

Inductive Loads: Transformers, solenoid valves, contactor coil control (AC loads with power factor ≥ 0.95)

Mixed Loads: Industrial ovens, plastic molding machines, welding equipment (suitable for AC-1/AC-3 mixed working conditions)

III. Detailed Explanation of Typical Application Scenarios

1. Water Treatment and Sewage Systems

Pump Control: Direct starting and protection of clean water pumps and sewage lift pumps, suitable for linkage control with liquid level sensors

Aeration System: Control of blower motors to ensure oxygen supply in biochemical tanks, suitable for use with frequency converters/soft starters

Key Advantages: 690V rated voltage suitable for industrial power supply, moisture-proof design, auxiliary contacts support fault alarm and status feedback

2. HVAC and Building Automation

Air Conditioning Compressors: Start-stop control of water chillers and outdoor air conditioning units, combined with temperature sensors to achieve constant temperature regulation

Ventilation Systems: Control of exhaust fans and supply fans, suitable for fire linkage (forced start in emergency situations)

Key Advantages: Compact 45mm width saves control cabinet space, wide voltage fluctuation adaptability (0.7~1.25Uc), low-noise operation

3. Oil and Gas Industry

Wellhead Control: Control of oil pumps and compressor motors, suitable for explosion-proof control cabinets (additional explosion-proof certification required)

Pipeline Transportation: Control of booster pumps and valve actuators, suitable for communication with remote I/O and SCADA systems

Key Advantages: Strong seismic resistance, high-strength wiring terminals, quick installation of surge suppressors, improved equipment mean time between failures (MTBF)

4. Manufacturing Automation

Packaging Machinery: Motor control of conveyor belts, sealing and cutting machines, labeling machines, suitable for high-speed start-stop and position control

Material Handling: Auxiliary motor control of cranes, hoists and stackers, suitable for mechanical interlock and safety protection

Textile Machinery: Control of fans and pumps for carding machines, looms and printing and dyeing equipment, suitable for coordinated operation of multiple motors

1. Application Limitations and Selection Recommendations

Unsuitable Scenarios

– DC motor control (dedicated DC contactors required)

– Loads exceeding 50A (it is recommended to upgrade to LC1D65 or LC1D80 series)

– Occasions with frequent forward-reverse rotation without mechanical interlock (it is recommended to use LC2D reversible contactors)

– High inductive shock loads (e.g., no-load switching of large transformers, it is recommended to install surge suppressors)

Optimal Adaptation Scenarios

– Direct starting, star-delta starting or autotransformer starting of AC-3 category squirrel cage motors (below 22kW)

– Occasions requiring 1NO+1NC auxiliary contacts to realize motor status monitoring and control interlock

– Applications with limited control cabinet space (width only 45mm) requiring high-density installation

– Frequent operation scenarios with high requirements for contactor mechanical service life (6 million operations) and electrical service life (1.5 million operations under AC-3)

1. Application Differences from Similar Products

With 50A rated current, AC-3 category adaptability, compact design and high reliability, LC1D50AM7C has become a mainstream choice in the field of industrial motor control and infrastructure. Its typical applications focus on scenarios such as pump/fan/compressor control, water treatment, HVAC, petrochemical industry, especially suitable for control loops requiring frequent start-stop, space optimization and safety interlock. During selection, it is necessary to consider load type, control voltage and environmental conditions; if necessary, it can be matched with thermal relays (such as LRD series) to achieve overload protection and improve system safety and service life.